Adsorptive Stripping Voltammetric Determination of the Pesticide Chinomethionate in Fruits

摘要

The electrochemical behaviour of the pesticide chinomethionate at a hanging mercury drop electrode is investigated. Differential pulse stripping voltammetry was used to determine chinomethionate in the presence of Britton-Robison (B-R) medium pH 4.56. Different parameters were tested to optimize the conditions for the determination of chinomethionate. The adsorbed form is reduced irreversibly. The linear concentration range is from 0.5-8.0 ng mL~(-1) chinomethionate. In this method, chinomethionate of 0.5 ng mL~(-1) with accumulation time 150 s can be determined successfully. This method was applied to analyze the spiked samples of apples and pears and found recoveries and relative standard deviation in the range of 89.33-98.00 % and 2.8-4.5 %, respectively.